CN108599851A - A kind of single spanning distance optical transmission system and method - Google Patents
A kind of single spanning distance optical transmission system and method Download PDFInfo
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- CN108599851A CN108599851A CN201810495161.0A CN201810495161A CN108599851A CN 108599851 A CN108599851 A CN 108599851A CN 201810495161 A CN201810495161 A CN 201810495161A CN 108599851 A CN108599851 A CN 108599851A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 101
- 230000005540 biological transmission Effects 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005086 pumping Methods 0.000 claims abstract description 227
- 239000000835 fiber Substances 0.000 claims description 110
- 239000013307 optical fiber Substances 0.000 claims description 71
- 230000009286 beneficial effect Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000003321 amplification Effects 0.000 description 13
- 238000003199 nucleic acid amplification method Methods 0.000 description 13
- 230000000243 photosynthetic effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000001069 Raman spectroscopy Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- FFKXTXJQZGIKQZ-UHFFFAOYSA-N ROPA Natural products O1C2C3C=C(CO)CC(C(C(C)=C4)=O)(O)C4C3(O3)C(C)CC2(C(C)=C)OC31CC1=CC=CC=C1 FFKXTXJQZGIKQZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
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Abstract
A kind of single spanning distance optical transmission system of offer of the embodiment of the present invention and method, wherein system include the first remote gain unit, the second remote gain unit, the first pumping source of bypass, bypass the second pumping source, with road pumping source and light receiving unit；Second remote gain unit includes the second front end wavelength division multiplexer and the second rear end wavelength division multiplexer, and the pump ports of the second rear end wavelength division multiplexer are connect with the pump ports of the second front end wavelength division multiplexer；First remote gain unit is connect with the signal port of the second front end wavelength division multiplexer, and the signal port of the second rear end wavelength division multiplexer is connect with road pumping source, is connect with light receiving unit with road pumping source；It bypasses the first pumping source and the second pumping source of bypass is connect with the first remote gain unit respectively.System and method provided in an embodiment of the present invention solve the problems, such as that relative intensity noise and multi-path interference existing for the Dan Suilu Remote optical pumping amplifier of current main-stream are excessive, improve the reliability and stability of single spanning distance optical transmission system.
Description
Technical field
The present embodiments relate to technical field of photo communication more particularly to a kind of single spanning distance optical transmission system and methods.
Background technology
Overlength single spanning distance optical transmission system is different from traditional communication system, and the cable length of single spanning distance generally requires several
Hundred kilometers, there cannot be any trunking among circuit.Overlength span all-optical transmission system is network security, stabilization, economy
Operation provides a strong guarantee.Due to reducing optical electrical conversion times, and the bandwidth resources that optical fiber can be utilized abundant, overlength
Distance transmission technology greatly reduces the cost of long distance transmission, and the reliability and transmission quality of simultaneity factor are obtained for guarantor
Card.
Passing through forward error correction technique, modulation format, increase transmission power, power amplifier, preamplifier and Raman
When the routine techniques such as amplification cannot still solve the problems, such as long span, the application of distant pump technology further expands single spanning distance distance.It is distant
(ROPA, the Remote Optically Pumped Amplifier) technology of pump is situated between by being inserted into the gains such as erbium-doped fiber in optical cable
Matter provides light amplification, while being not required to power supply facilities in the point, is also not required to personnel's maintenance, suitable for passing through desert, plateau, lake
The area that pool, straits etc. are safeguarded, power supply is inconvenient reduces regular maintenance cost because without relay station.
Current Remote optical pumping amplifier mainly uses Dan Suilu Remote optical pumping amplifier, i.e. signal light and pump light to be passed in same root optical fiber
Defeated, in system transmitting terminal, because signal light power is excessive, heavy pumping luminous power will produce excessive relative intensity noise and multipath is dry
It relates to, the reliability and stability of deterioration signal transmission quality, system are affected.
Invention content
A kind of single spanning distance optical transmission system of offer of the embodiment of the present invention and method, to solve the distant pump systems of existing Dan Suilu
It unites the problems such as limited transmission distance, system receptivity are limited, system reliability and stability are low.
On the one hand, the embodiment of the present invention provides a kind of single spanning distance optical transmission system, including the first remote gain unit, second
Remote gain unit, bypasses the second pumping source, with road pumping source and light receiving unit at the first pumping source of bypass；Wherein, described
Two remote gain units include the second front end wavelength division multiplexer and the second rear end wavelength division multiplexer, second front end wavelength-division multiplex
The public port of device is connect by the second Er-doped fiber with the public port of second rear end wavelength division multiplexer, after described second
The pump ports of end wavelength division multiplexer are connect with the pump ports of second front end wavelength division multiplexer；First remote gain
Unit is connect with road optical fiber with the signal port of second front end wavelength division multiplexer by first, and second rear end wavelength-division is multiple
It is connect with road pumping source with described with road optical fiber by second with the signal port of device, it is described with road pumping source and the light-receiving
Unit connects；The first pumping source of the bypass is connect by the first bypass fibers with the first remote gain unit, the side
The second pumping source of road is connect by the second bypass fibers with the first remote gain unit.
On the other hand, the embodiment of the present invention provides a kind of single spanning distance optical transmission method, including：By source signal light, bypass
The pump light that the pump light and the second pumping source of bypass that first pumping source is sent out are sent out is input to the first remote gain unit,
Export the first gain signal light；The first gain signal light is input to second front end by described first with road optical fiber
The signal port of wavelength division multiplexer, by the pump light sent out with road pumping source by described second with road optical fiber, described
The signal port and pump ports of two rear end wavelength division multiplexers are input to the pump ports of second front end wavelength division multiplexer；It will
The signal light of the public port output of second front end wavelength division multiplexer is input to described the by second Er-doped fiber
The public port of two rear end wavelength division multiplexers, the signal light that the signal port of the second rear end wavelength division multiplexer is exported is as second
Gain signal light；The second gain signal light with road optical fiber and described be input to light with road pumping source and connect by described second
Receive unit.
A kind of single spanning distance optical transmission system provided in an embodiment of the present invention and method, by configuring by the first remote gain list
Member, the first pumping source of bypass and the double bypass Remote optical pumping amplifier for bypassing the second pumping source composition, solve the Dan Suilu of current main-stream
The excessive problem of relative intensity noise and multi-path interference existing for Remote optical pumping amplifier.Meanwhile by configuring the second remote gain unit
With with road pumping source, the forward pumping of the second remote gain unit is realized, single spanning distance optical transmission system is further improved
Reliability and stability.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram of single spanning distance optical transmission system of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the second remote gain unit of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the first remote gain unit of the embodiment of the present invention；
Fig. 4 is the first Er-doped fiber length and gain curve figure of the first remote gain unit of the embodiment of the present invention；
Fig. 5 is the second Er-doped fiber length and gain curve figure of the second remote gain unit of the embodiment of the present invention；
Fig. 6 is the first remote gain module gain and single spanning distance optical transmission system optical signal to noise ratio curve of the embodiment of the present invention
Figure；
Fig. 7 is the second remote gain module gain and single spanning distance optical transmission system optical signal to noise ratio curve of the embodiment of the present invention
Figure；
Fig. 8 is that the first remote gain unit of the embodiment of the present invention and the span of the second remote gain unit are believed with system light
It makes an uproar and compares curve graph；
Fig. 9 is the structure chart that single bypass remote gain unit is combined with Sui Lu+bypass remote gain unit；
Figure 10 is the structure chart that single bypass remote gain unit is combined with great distance journey gain unit；
Figure 11 is a kind of flow diagram of single spanning distance optical transmission method of the embodiment of the present invention；
Reference sign：
1- the first remote gain units；2- first is with road optical fiber；3- the second remote gain units；
4- second is with road optical fiber；5- is with road pumping source；6- light receiving units；
The first bypass fibers of 7-；The second bypass fibers of 8-；9- bypasses the first pumping source；
10- bypasses the second pumping source；The first front ends 11- wavelength division multiplexer；The first rear ends 12- wavelength division multiplexer；
The first Er-doped fibers of 13-；The second front ends 31- wavelength division multiplexer；The second rear ends 32- wavelength division multiplexer；
The second Er-doped fibers of 33-.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Exist because signal light power is excessive for the Dan Suilu Remote optical pumping amplifier of current main-stream, heavy pumping luminous power will produce
Big relative intensity noise and multi-path interference, the reliability and stability difference of system caused by deterioration signal transmission quality are asked
Topic, the embodiment of the present invention propose a kind of single spanning distance optical transmission system, and Fig. 1 is a kind of single spanning distance optical transport of the embodiment of the present invention
The structural schematic diagram of system, as shown in Figure 1, single spanning distance optical transmission system includes the first remote gain unit 1, the second remote gain
Unit 3, bypasses the second pumping source 10, with road pumping source 5 and light receiving unit 6 at the first pumping source 9 of bypass.
Specifically, 1 corresponding remotely pumping unit of the first remote gain unit is the first pumping source of bypass 9 and bypass second
Pumping source 10, the first remote gain unit 1, the first pumping source 9 of bypass, the second pumping source 10 of bypass and connection first remotely increase
The second pumping source of the first bypass fibers 7, the first remote gain unit 1 of connection and bypass of the first pumping source 9 of beneficial unit 1 and bypass
10 the second bypass fibers 8 together constitute double bypass Remote optical pumping amplifier.Second remote gain unit 3 corresponds to remotely pumping unit
With road pumping source 5, the second remote gain unit 3 is pumped with road pumping source 5 and the second remote gain unit 3 of connection and with road
The second of source 5 together constitutes Dan Suilu Remote optical pumping amplifier with road optical fiber 4.Source signal light by double bypass Remote optical pumping amplifier and it is single with
It is input to light receiving unit 6 after the Remote optical pumping amplifier of road, completes the single spanning distance transmission of source signal light.Herein, light receiving unit 6 includes
Photoreceiver can also include preamplifier and dispersion post-compensation module etc., and the embodiment of the present invention is not especially limited this.
In single spanning distance optical transmission system, source signal light initially enters the first remote gain unit 1, laggard by amplifying
Enter first with road optical fiber 2, enter the second remote gain unit 3 after first transmits with road optical fiber 2, by being amplified into the
Two, with road optical fiber 4, enter with road pumping source 5 after second transmits with road optical fiber 4, finally enter light receiving unit 6.
Further, Fig. 2 is the structural schematic diagram of the second remote gain unit 3 of the embodiment of the present invention, as shown in Fig. 2,
Second remote gain unit 3 includes the second front end wavelength division multiplexer 31 and the second rear end wavelength division multiplexer 32, the second front end wavelength-division
The public port of multiplexer 31 is connect by the second Er-doped fiber 33 with the public port of the second rear end wavelength division multiplexer 32, and second
The pump ports of rear end wavelength division multiplexer 32 are connect with the pump ports of the second front end wavelength division multiplexer 31.First remote gain list
Member 1 is connect with road optical fiber 2 with the signal port of the second front end wavelength division multiplexer 31 by first, the second rear end wavelength division multiplexer 32
Signal port connect with road pumping source 5 with road optical fiber 4 by second, connect with light receiving unit 6 with road pumping source 5；It is other
The first pumping source of road 9 is connect by the first bypass fibers 7 with the first remote gain unit 1, and the second pumping source 10 of bypass passes through the
Two bypass fibers 8 are connect with the first remote gain unit 1.
Herein, the pump light source of the second remote gain unit 3 comes from transmits by second with road optical fiber 4 with road pumping source 5
Pump light, the pump light enter the second rear end wavelength division multiplexer 32 signal port after, pass through the second rear end wavelength division multiplexer
32 separate pump light, and are exported from the pump ports of the second rear end wavelength division multiplexer 32, and second is transferred to by optical fiber
The pump ports of front end wavelength division multiplexer 31 export in the second front end wavelength division multiplexer 31 with the first remote gain unit 1
The photosynthetic wave of first gain signal realizes forward pumping amplification.
It should be noted that the first pumping source of above-mentioned bypass 9, the second pumping source 10 of bypass, with road pumping source 5 can be one
Rank pumping, second-order pump or the pumping of three ranks, the embodiment of the present invention are not especially limited this, and at above-mentioned three kinds, one
The wave-length coverage of rank pump light is preferably 1480-1500nm.
In the embodiment of the present invention, by configuring by the first remote gain unit 1, the first pumping source 9 of bypass and bypass second
Double bypass Remote optical pumping amplifier that pumping source 10 is constituted, solve relative intensity noise existing for the Dan Suilu Remote optical pumping amplifier of current main-stream
The excessive problem with multi-path interference.Meanwhile by configuring the second remote gain unit 3 with road pumping source 5, it is remote to realize second
The forward pumping of journey gain unit 3 further improves the reliability and stability of single spanning distance optical transmission system.
Based on above-described embodiment, Fig. 3 is the structural schematic diagram of the first remote gain unit 1 of the embodiment of the present invention, such as Fig. 3
Shown, a kind of single spanning distance optical transmission system, the first remote gain unit 1 includes the first front end wavelength division multiplexer 11 and the first rear end
The public port of wavelength division multiplexer 12, the first front end wavelength division multiplexer 11 is multiple by the first Er-doped fiber 13 and the first rear end wavelength-division
It is connected with the public port of device 12；Accordingly, the first pumping source 9 of bypass is multiple by the first bypass fibers 7 and the first front end wavelength-division
It is connected with the pump ports of device 11, the second pumping source 10 of bypass passes through the second bypass fibers 8 and the second front end wavelength division multiplexer 31
Pump ports connection.
Herein, the pump light source of the first remote gain unit 1 passes through the first bypass fibers 7 from the first pumping source 9 of bypass
Pump light of the pump light and the second pumping source 10 of bypass of transmission by the transmission of the second bypass fibers 8.Wherein, the first pumping of bypass
Source 9 is after the pump light that the first bypass fibers 7 are transmitted enters the pump ports of the first front end wavelength division multiplexer 11, before first
It holds in wavelength division multiplexer 11 with the photosynthetic wave of source signal, realizes forward pumping amplification.The second pumping source 10 is bypassed to pass through by the of second
After the pump light that road optical fiber 8 transmits enters the pump ports of the first rear end wavelength division multiplexer 12, in the first rear end wavelength division multiplexer
With the photosynthetic wave signal into 12 public port of the first rear end wavelength division multiplexer in 12, backward pump amplification is realized.
In the embodiment of the present invention, by configuring the second pump of the first remote gain unit 1, the first pumping source 9 of bypass and bypass
Pu source 10 realizes the two directional pump of the first remote gain unit 1, improves the reliability and stabilization of single spanning distance optical transmission system
Property.
Based on any of the above-described embodiment, with reference to figure 1, a kind of single spanning distance optical transmission system, including the first remote gain unit
1, the second remote gain unit 3, bypass the first pumping source 9, bypass the second pumping source 10, with road pumping source 5 and light receiving unit
6.First remote gain unit 1 is connect with road optical fiber 2 with the second remote gain unit 3 by first, the second remote gain unit 3
It is connect with road pumping source 5 with road optical fiber 4 by second, is connect with light receiving unit 6 with road pumping source 5, constitute the transmission of light
Path.In addition, the first remote gain unit 1 is connect with the first pumping source 9 of bypass and the second pumping source 10 of bypass respectively, constitute double
Bypass Remote optical pumping amplifier.Second remote gain unit 3 is connect with road pumping source 5, constitutes Dan Suilu Remote optical pumping amplifier.
Wherein, with reference to figure 3, the first remote gain unit 1 includes the first front end wavelength division multiplexer 11 and the first rear end wavelength-division
The public port of multiplexer 12, the first front end wavelength division multiplexer 11 passes through the first Er-doped fiber 13 and the first rear end wavelength division multiplexer
12 public port connection.Bypass pumping of first pumping source 9 by the first bypass fibers 7 and the first front end wavelength division multiplexer 11
Port connects, and the second pumping source 10 of bypass is connected by the second bypass fibers 8 and the pump ports of the second front end wavelength division multiplexer 31
It connects.It follows that the pump light source of the first remote gain unit 1 is passed from the first pumping source 9 of bypass by the first bypass fibers 7
Pump light of the defeated pump light and the second pumping source 10 of bypass by the transmission of the second bypass fibers 8.Wherein, the first pumping source is bypassed
9 after the pump light of the first bypass fibers 7 transmission enters the pump ports of the first front end wavelength division multiplexer 11, in the first front end
With the photosynthetic wave of source signal in wavelength division multiplexer 11, forward pumping amplification is realized.The second pumping source 10 is bypassed by the second bypass
After the pump light that optical fiber 8 transmits enters the pump ports of the first rear end wavelength division multiplexer 12, in the first rear end wavelength division multiplexer 12
In with enter 12 signal port of the first rear end wavelength division multiplexer photosynthetic wave signal, realize backward pump amplification.
With reference to figure 2, the second remote gain unit 3 includes the second front end wavelength division multiplexer 31 and the second rear end wavelength division multiplexer
32, the public affairs that the public port of the second front end wavelength division multiplexer 31 passes through the second Er-doped fiber 33 and the second rear end wavelength division multiplexer 32
Port connection altogether, the pump ports of the second rear end wavelength division multiplexer 32 and the pump ports of the second front end wavelength division multiplexer 31 connect
It connects.The pump light source of second remote gain unit 3, should from the pump light transmitted with road optical fiber 4 by second with road pumping source 5
After pump light enters the signal port of the second rear end wavelength division multiplexer 32, pump light is divided by the second rear end wavelength division multiplexer 32
It separates out and, and exported from the pump ports of the second rear end wavelength division multiplexer 32, the second front end wavelength-division multiplex is transferred to by optical fiber
The pump ports of device 31, the first gain signal exported with the first remote gain unit 1 in the second front end wavelength division multiplexer 31
Photosynthetic wave realizes forward pumping amplification.
In conjunction with Fig. 1, Fig. 2 and Fig. 3 it is found that the signal end of the first rear end wavelength division multiplexer 12 of the first remote gain unit 1
Mouth is connect with road optical fiber 2 with the signal port of the second front end wavelength division multiplexer 31 of the second remote gain unit 3 by first, the
The signal port of second rear end wavelength division multiplexer 32 of two remote gain units 3 is by second with road optical fiber 4 and with road pumping source 5
Connection.
In the embodiment of the present invention, by configuring by the first remote gain unit 1, the first pumping source 9 of bypass and bypass second
The double bypass Remote optical pumping amplifier and the second remote gain unit 3 that pumping source 10 is constituted and the forward pumping type constituted with road pumping source 5
Dan Suilu Remote optical pumping amplifier, solve relative intensity noise and multi-path interference mistake existing for the Dan Suilu Remote optical pumping amplifier of current main-stream
Big problem further improves the reliability and stability of single spanning distance optical transmission system.
In current single spanning distance optical transmission system design, remote gain unit and remotely pumping unit be it is individually designed,
The corresponding remotely pumping unit of remote gain unit how to configure with realize optimization and remote gain unit position how
Confirm, be to choose based on experience value, is not designed by specific calculate so that the output light noise of existing Remote optical pumping amplifier
Than maximum value is not achieved, reliability and stability cannot reach optimum efficiency.In view of the above-mentioned problems, being based on any of the above-described implementation
Example, the embodiment of the present invention propose a kind of single spanning distance optical transmission system, wherein the length of the first bypass fibers and the second bypass fibers
Length be pumping light power and the pump light that sends out of the first pumping source of bypass according to the first pumping source of bypass in the first bypass
Loss factor in optical fiber, and the pump light that the pumping light power of the second pumping source of bypass and the second pumping source of bypass are sent out exist
What the loss factor in the second bypass fibers determined.
Specifically, the length of the length of the first bypass fibers and the second bypass fibers can be obtained by following formula：L7(km)=L8
(km)={ [Ppump7(dBm)-3]/αpump7, [Ppump8(dBm)-3]/αpump8}min；
In formula, L7For the length of the first bypass fibers, unit km.L8For the length of the second bypass fibers, unit km.
Ppump7To bypass the pumping light power of the first pumping source, unit dBm.Ppump8To bypass the pumping light power of the second pumping source,
Unit is dBm.αpump7For loss factor of the pump light that sends out of the first pumping source of bypass in the first bypass fibers, unit is
dB/km。αpump8For loss factor of the pump light that sends out of the second pumping source of bypass in the second bypass fibers, unit dB/km.
In the embodiment of the present invention, the length of the first bypass fibers and the second bypass fibers is determined by calculation, according to upper
The position that length determines the first remote gain unit is stated, the output optical signal to noise ratio of the first remote gain unit is improved, optimizes
The reliability and stability of single spanning distance optical transmission system.
Based on any of the above-described embodiment, a kind of single spanning distance optical transmission system, second with the length of road optical fiber is according to road
What the pumping light power of pumping source and the pump light sent out with road pumping source were determined second with the loss factor in the optical fiber of road.
Specifically, it second can be obtained by following formula with the length of road optical fiber：
L4(km)=[Ppump5(dBm)-10]/αpump5；
In formula, L4For second with road optical fiber length, unit km.Ppump5For with the pumping light power of road pumping source, list
Position is dBm.αpump5For the pump light that is sent out with road pumping source second with the loss factor in the optical fiber of road, unit dB/km.
In the embodiment of the present invention, the second length with road optical fiber has been determined by calculation, second is determined according to above-mentioned length
The position of remote gain unit improves the output optical signal to noise ratio of the second remote gain unit, optimizes single spanning distance optical transport system
The reliability and stability of system.
Based on any of the above-described embodiment, a kind of single spanning distance optical transmission system, first is with road optical fiber with second with road optical fiber
Same fibre core, the first bypass fibers and the second bypass fibers are respectively independent fibre core；By the length of first bypass fibers and second
The equal length of road optical fiber, be first with road optical fiber length with second with road optical fiber the sum of length.
Specifically, based on above-described embodiment can determine the length of the first bypass fibers, the length of the second bypass fibers and
Second with road optical fiber length.On this basis, by the length of the first bypass fibers be first with road optical fiber length and second
The sum of length with road optical fiber can determine the first length with road optical fiber.
Based on any of the above-described embodiment, a kind of single spanning distance optical transmission system, the first Er-doped fiber and/or the second Er-doped fiber
The ranging from 5-6dB/m of absorption coefficient at 1530nm wavelength；First Er-doped fiber and/or the second Er-doped fiber numerical aperture NA
Ranging from 0.3-0.35.
Based on any of the above-described embodiment, a kind of single spanning distance optical transmission system further includes light transmission unit, light transmission unit with
First remote gain unit connects.Wherein, light transmission unit is for generating source signal light and the source signal light being passed through light
Fibre is transferred to the first remote gain unit.Herein, light transmission unit includes optical transmitter, can also include power amplifier, this
Inventive embodiments are not construed as limiting this.
Based on any of the above-described embodiment, a kind of single spanning distance optical transmission system, the first remote gain unit and second remotely increases
The gain ranging of beneficial unit is 18dB -28dB.The length of first Er-doped fiber and/or the length of the second Er-doped fiber can lead to
Following method is crossed to obtain：
Fig. 4 is the first Er-doped fiber length and gain curve figure of the first remote gain unit of the embodiment of the present invention, such as
Shown in Fig. 4, there are maximum values for the gain (Gain) of the first remote gain unit, i.e., long in best Er-doped fiber (RGU1EDF)
Degree is lower to realize maximum gain.Similarly, Fig. 5 be the embodiment of the present invention the second remote gain unit the second Er-doped fiber length with
Gain curve figure, as shown in figure 5, there are maximum values for the gain (Gain) of the second remote gain unit, i.e., in best er-doped light
Maximum gain is realized under fine (RGU2EDF) length.
For the gain ranging that specification the first remote gain unit must satisfy, Fig. 6 shows the first remote gain unit
Gain (Gain) and single spanning distance optical transmission system optical signal to noise ratio OSNR curve graphs, as shown in fig. 6, in 10dB -18dB ranges
The OSNR performance changes of system are very big；The OSNR performance changes of system are smaller in 18dB -28dB ranges, start to tend to be full
With.Thus in the first remote gain unit designing gain, only need to meet 18dB gains can meet system requirements, while first
Remote gain unit can be placed at farthest position, and the performance of single spanning distance optical transmission system being capable of being optimal.
Simultaneously for the gain ranging that specification the second remote gain unit must satisfy, Fig. 7 shows the second remote gain
Module gain (Gain) and single spanning distance optical transmission system optical signal to noise ratio OSNR curve graphs, as shown in fig. 7, in 15dB -18dB ranges
The OSNR performance changes of interior system are very big；In 18dB -28dB ranges the OSNR performance changes of single spanning distance optical transmission system compared with
It is small, start to tend to be saturated.Thus in the second remote gain unit designing gain, only need to meet 18dB gains can meet system
It is required that while the second remote gain unit can be placed at farthest position, the performance of single spanning distance optical transmission system can reach
It optimizes.
In conjunction with the Er-doped fiber length of above-mentioned first remote gain unit and the second remote gain unit, optimized gain etc.
After complex optimum, Fig. 8 shows span and the single spanning distance optical transport system of the first remote gain unit and the second remote gain unit
System optical signal to noise ratio OSNR curve graphs.As shown in figure 8, to reach single spanning distance optical transmission system Performance optimization, the first remote gain
Span between unit and the second remote gain unit is the smaller the better.Thus, it is enough in the first remote gain unit placement location
While remote, the remoter the placement location of second remote gain unit also the better, could make single spanning distance optical transmission system in this way
OSNR is optimized.
It is carried out in order to better understand with shown below with a kind of single spanning distance optical transmission system proposed by the present invention, the present invention is applied
Example, and the present invention is not only limited to following example.
As shown in Figure 1, a kind of single spanning distance optical transmission system include the first remote gain unit, the second remote gain unit,
Bypass the first pumping source, the second pumping source of bypass, with road pumping source and light receiving unit.Wherein, by configuring the first long-range increasing
Beneficial unit, the first pumping source of bypass and the second pumping source of bypass realize the two directional pump of the first remote gain unit, by matching
It sets the second remote gain unit and realizes the forward pumping of the second remote gain unit with road pumping source.
In order to calculate the performance of single spanning distance optical transmission system shown in FIG. 1, the transmission for sending out source signal light is set
The Output optical power of power amplifier BA in unit is 20dBm, noise figure 5dB；First remote gain module gain is
20dB, noise figure 6dB；Second remote gain module gain is 20dB, noise figure 6dB；With the Raman of road pumping source
Gain is 18dB, and noise figure is -2dB；System total losses are 74dB, wherein transmission unit and the first remote gain module gain
Between fibre loss be 47dB, between the first remote gain module gain and the second remote gain module gain first with road light
Fibre loss is 10dB, and second is 17dB with road fibre loss between the second remote gain module gain and receiving unit, according to
G.692, ITU-T Rec define the light receiving unit output optical noise ratio OSNR tables that can obtain system with system equivalent noise figure
Up to formula, the OSNR that can calculate the light receiving unit of system shown in FIG. 1 is 24.56dB.
Fig. 9 is the structure chart that single bypass remote gain unit is combined with Sui Lu+bypass remote gain unit, as shown in figure 9,
Be different from the single spanning distance optical transmission system of Fig. 1, in Fig. 9, the pump light source of the first remote gain unit 901 come from after to bypass the
Pump light of two pumping sources 910 by the transmission of the second bypass fibers 908；After the pump light source of second remote gain unit 903 is come
Pass through the pump light and come from road pumping source 905 by second that the first bypass fibers 908 are transmitted to the first pumping source 909 of bypass
With the total pump light for the pump light that road optical fiber 904 transmits.
To calculate the performance of system in Fig. 9, the Output optical power that the power amplifier BA of transmission unit is arranged is 20dBm,
Noise figure is 5dB；First remote gain module gain is 20dB, noise figure 6dB；Second remote gain module gain is
20dB, noise figure 6dB；Raman gain with road pumping source is 18dB, and noise figure is -2dB；System total losses are
Fibre loss is 50dB between 74dB, wherein transmission unit and the first remote gain module gain, and the first remote gain unit increases
Benefit and the second remote gain module gain between first with road fibre loss be 7dB, the second remote gain module gain and light
Second is 17dB with road fibre loss between receiving unit, is G.692 defined with system equivalent noise figure according to ITU-T Rec
It can show that system output exports optical noise ratio OSNR expression formulas, can be with the OSNR of the light receiving unit of calculation system
21.78dB.It follows that in the case that being all made of double bypasses, shown in OSNR ratios Fig. 9 of system light receiving unit shown in FIG. 1
System light receiving unit OSNR improve 2.78dB.
Figure 10 is the structure chart that single bypass remote gain unit is combined with great distance journey gain unit, as shown in Figure 10, area
Not in the single spanning distance optical transmission system of Fig. 1, the pump light source of the first remote gain unit 1001 is from the first pumping source of bypass
1009 pump light by the transmission of the first bypass fibers 1007；The pump light source of second remote gain unit 1003 only from
The pump light that road pumping source 1005 is transmitted by second with road optical fiber 1004.
To calculate the performance of system in Figure 10, the Output optical power that the power amplifier BA of transmission unit is arranged is 20dBm,
Noise figure is 5dB；First remote gain module gain is 20dB, noise figure 6dB；Second remote gain module gain is
20dB, noise figure 6dB；Raman gain with road pumping source is 18dB, and noise figure is -2dB；System total losses are
Fibre loss is 50dB between 74dB, wherein transmission unit and the first remote gain module gain, and the first remote gain unit increases
Benefit and the second remote gain module gain between first with road fibre loss be 7dB, the second remote gain module gain and light
Second is 17dB with road fibre loss between receiving unit, is G.692 defined with system equivalent noise figure according to ITU-T Rec
It can show that system output exports optical noise ratio OSNR expression formulas, can be with the OSNR of the light receiving unit of calculation system
21.74dB.It follows that the OSNR of system light receiving unit shown in FIG. 1 is than system light receiving unit shown in Fig. 10
OSNR improves 2.82dB.
In summary, system shown in FIG. 1, by configuring by the first remote gain unit, the first pumping source of bypass and side
Double bypass Remote optical pumping amplifier that the second pumping source of road is constituted, solve relative intensity existing for the Dan Suilu Remote optical pumping amplifier of current main-stream
Noise and the excessive problem of multi-path interference.Meanwhile by configuring the second remote gain unit with road pumping source, realizing second
The forward pumping of remote gain unit further improves the reliability and stability of single spanning distance optical transmission system.
Based on any of the above-described system embodiment, Figure 11 is a kind of flow of single spanning distance optical transmission method of the embodiment of the present invention
Schematic diagram, as shown in figure 11, a method of single spanning distance optical transport is carried out based on single spanning distance optical transmission system, including：
1101, by the pump light that source signal light, the first pumping source of bypass are sent out and the pump that the second pumping source of bypass is sent out
Pu light is input to the first remote gain unit, exports the first gain signal light.
Wherein, the first gain signal signal light that just the first remote gain unit exports.First remote gain unit pair
The remotely pumping unit answered is the second pumping source of the first pumping source of bypass and bypass, the first remote gain unit, the first pump of bypass
First bypass fibers of Pu source, the second pumping source of bypass and the first remote gain unit of connection and the first pumping source of bypass connect
The second bypass fibers for connecing the second pumping source of the first remote gain unit and bypass together constitute double bypass Remote optical pumping amplifier.
1102, the first gain signal light is input to the second remote gain unit, output second by first with road optical fiber
Gain signal light.
With reference to figure 2, the second remote gain unit includes the second front end wavelength division multiplexer and the second rear end wavelength division multiplexer, the
The public port of two front end wavelength division multiplexers is connect by the second Er-doped fiber with the signal port of the second rear end wavelength division multiplexer,
The pump ports of second rear end wavelength division multiplexer are connect with the pump ports of the second front end wavelength division multiplexer.First remote gain list
Member is connect with road optical fiber with the signal port of the second front end wavelength division multiplexer by first, the signal of the second rear end wavelength division multiplexer
Port is connect with road optical fiber with road pumping source by second, is connect with light receiving unit with road pumping source；The first pumping of bypass
Source is connect by the first bypass fibers with the first remote gain unit, and the second pumping source of bypass passes through the second bypass fibers and first
Remote gain unit connects.
The signal port that first gain signal light is inputted by first with road optical fiber to the second front end wavelength division multiplexer, will be with
The pump light that road pumping source is sent out is defeated with road optical fiber, the signal port of the second rear end wavelength division multiplexer and pump ports by second
Enter to the pump ports of the second front end wavelength division multiplexer；The signal light that the public port of second front end wavelength division multiplexer exports is led to
The public port that the second Er-doped fiber is input to the second rear end wavelength division multiplexer is crossed, by the signal end of the second rear end wavelength division multiplexer
The signal light of mouth output is as the second gain signal light.
Herein, the pump light source of the second remote gain unit is from the pump transmitted with road optical fiber by second with road pumping source
Pu light after the pump light enters the signal port of the second rear end wavelength division multiplexer, will be pumped by the second rear end wavelength division multiplexer
Light is separated, and is exported from the pump ports of the second rear end wavelength division multiplexer, and it is multiple to be transferred to the second front end wavelength-division by optical fiber
It is photosynthetic with the first gain signal of the first remote gain unit output in the second front end wavelength division multiplexer with the pump ports of device
Wave realizes forward pumping amplification.
1103, the second gain signal light is input to light receiving unit with road optical fiber and with road pumping source by second.This
Place has the effect of amplification with road pumping source pair the second gain signal light.Light receiving unit includes photoreceiver, can also include
Preamplifier and dispersion post-compensation module etc., the embodiment of the present invention is not especially limited this.
It should be noted that the first pumping source of above-mentioned bypass, the second pumping source of bypass, can be single order pump with road pumping source
Pu, second-order pump or the pumping of three ranks, the embodiment of the present invention are not especially limited this, and at above-mentioned three kinds, single order pumps
The wave-length coverage of Pu light is preferably 1480-1500nm.
In the embodiment of the present invention, by configuring by the second pump of the first remote gain unit, the first pumping source of bypass and bypass
Pu source constitute double bypass Remote optical pumping amplifier, solve relative intensity noise existing for the Dan Suilu Remote optical pumping amplifier of current main-stream with it is more
The excessive problem of path interferometer.Meanwhile by configuring the second remote gain unit with road pumping source, realizing the second remote gain
The forward pumping of unit further improves the reliability and stability of single spanning distance optical transmission system.
Based on any of the above-described embodiment, with reference to figure 3, a kind of single spanning distance optical transmission system, the first remote gain unit includes
First front end wavelength division multiplexer and the first rear end wavelength division multiplexer, the public port of the first front end wavelength division multiplexer are mixed by first
Erbium optical fiber is connect with the public port of the first rear end wavelength division multiplexer.
Accordingly, a method of single spanning distance optical transport being carried out based on single spanning distance optical transmission system, step 1101 is by source
The pump light that the pump light and the second pumping source of bypass that signal light, the first pumping source of bypass are sent out are sent out is input to the first long-range increasing
Beneficial unit exports the first gain signal light, further comprises：
Source signal light is input to the signal port of the first front end wavelength division multiplexer, will bypass what the first pumping source was sent out
Pump light is input to the pump ports of the first front end wavelength division multiplexer by the first bypass fibers.Bypass what the first pumping source was sent out
It is photosynthetic with source signal in the first front end wavelength division multiplexer after pump light enters the pump ports of the first front end wavelength division multiplexer
Wave realizes forward pumping amplification.
The signal light that the public port of first front end wavelength division multiplexer exports is input to first by the first Er-doped fiber
The public port of rear end wavelength division multiplexer will bypass the pump light that sends out of the second pumping source and be input to the by the second bypass fibers
The pump ports of one rear end wavelength division multiplexer, the signal light that the signal port of the first rear end wavelength division multiplexer is exported is as first
Gain signal light.Herein, after the pump light that the second pumping source of bypass is sent out enters the pump ports of the first rear end wavelength division multiplexer,
In the first rear end wavelength division multiplexer with enter the first rear end wavelength division multiplexer public port photosynthetic wave signal, to pump after realization
Amplify at Pu.
In the embodiment of the present invention, by configuring the second pumping of the first remote gain unit, the first pumping source of bypass and bypass
Source realizes the two directional pump of the first remote gain unit, improves the reliability and stability of single spanning distance optical transmission system.
Based on any of the above-described embodiment, with reference to figure 1, Fig. 2 and Fig. 3, one kind carrying out single span based on single spanning distance optical transmission system
Method away from optical transport, including：
Source signal light is input to the signal port of the first front end wavelength division multiplexer, will bypass what the first pumping source was sent out
Pump light is input to the pump ports of the first front end wavelength division multiplexer by the first bypass fibers.Bypass what the first pumping source was sent out
It is photosynthetic with source signal in the first front end wavelength division multiplexer after pump light enters the pump ports of the first front end wavelength division multiplexer
Wave realizes forward pumping amplification.
The signal light that the public port of first front end wavelength division multiplexer exports is input to first by the first Er-doped fiber
The public port of rear end wavelength division multiplexer will bypass the pump light that sends out of the second pumping source and be input to the by the second bypass fibers
The pump ports of one rear end wavelength division multiplexer, the signal light that the signal port of the first rear end wavelength division multiplexer is exported is as first
Gain signal light.Herein, after the pump light that the second pumping source of bypass is sent out enters the pump ports of the first rear end wavelength division multiplexer,
In the first rear end wavelength division multiplexer with enter the first rear end wavelength division multiplexer public port photosynthetic wave signal, to pump after realization
Amplify at Pu.
The signal port that first gain signal light is inputted by first with road optical fiber to the second front end wavelength division multiplexer, will be with
The pump light that road pumping source is sent out is defeated with road optical fiber, the signal port of the second rear end wavelength division multiplexer and pump ports by second
Enter to the pump ports of the second front end wavelength division multiplexer；The signal light that the public port of second front end wavelength division multiplexer exports is led to
The public port that the second Er-doped fiber is input to the second rear end wavelength division multiplexer is crossed, by the signal end of the second rear end wavelength division multiplexer
The signal light of mouth output is as the second gain signal light.Herein, the pump light source of the second remote gain unit comes from and is pumped with road
The pump light that source is transmitted by second with road optical fiber after the pump light enters the signal port of the second rear end wavelength division multiplexer, leads to
It crosses the second rear end wavelength division multiplexer to separate pump light, and is exported from the pump ports of the second rear end wavelength division multiplexer, warp
Cross the pump ports that optical fiber is transferred to the second front end wavelength division multiplexer, in the second front end wavelength division multiplexer with the first remote gain
The photosynthetic wave of the first gain signal of unit output realizes forward pumping amplification.
Second gain signal light is input to light receiving unit with road optical fiber and with road pumping source by second.
In the embodiment of the present invention, by by the second pumping source of the first remote gain unit, the first pumping source of bypass and bypass
The Dan Suilu of the double bypass Remote optical pumping amplifier and the second remote gain unit and the forward pumping type constituted with road pumping source that constitute is distant
It is excessive to solve relative intensity noise and multi-path interference existing for the Dan Suilu Remote optical pumping amplifier of current main-stream for the transmission of pumping system
Problem further improves the reliability and stability of single spanning distance optical transmission system.
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the embodiment of the present invention rather than right
It is limited；Although the embodiment of the present invention is described in detail with reference to foregoing embodiments, the ordinary skill of this field
Personnel should understand that：It still can be with technical scheme described in the above embodiments is modified, or to which part
Or all technical features carries out equivalent replacement；And these modifications or replacements, it does not separate the essence of the corresponding technical solution
The range of each embodiment technical solution of the embodiment of the present invention.
Claims (10)
1. a kind of single spanning distance optical transmission system, which is characterized in that including the first remote gain unit, the second remote gain unit,
Bypass the first pumping source, the second pumping source of bypass, with road pumping source and light receiving unit；
Wherein, the second remote gain unit includes the second front end wavelength division multiplexer and the second rear end wavelength division multiplexer, described
The common end that the public port of second front end wavelength division multiplexer passes through the second Er-doped fiber and second rear end wavelength division multiplexer
Mouth connection, the pump ports of second rear end wavelength division multiplexer connect with the pump ports of second front end wavelength division multiplexer
It connects；
The first remote gain unit connects by first with the signal port of road optical fiber and second front end wavelength division multiplexer
It connects, the signal port of second rear end wavelength division multiplexer is connect with described with road pumping source by second with road optical fiber, described
It is connect with the light receiving unit with road pumping source；The first pumping source of the bypass is remote with described first by the first bypass fibers
Journey gain unit connects, and the second pumping source of the bypass is connect by the second bypass fibers with the first remote gain unit.
2. system according to claim 1, which is characterized in that the first remote gain unit includes the first front end wavelength-division
Multiplexer and the first rear end wavelength division multiplexer, the public port of first front end wavelength division multiplexer by the first Er-doped fiber with
The public port of first rear end wavelength division multiplexer connects；
Accordingly, the bypass pump of first pumping source by first bypass fibers and first front end wavelength division multiplexer
Pu port connects, the bypass pump of second pumping source by second bypass fibers and second front end wavelength division multiplexer
Pu port connects.
3. system according to claim 1, which is characterized in that the length of first bypass fibers and second bypass
The length of optical fiber meets following formula：
L7(km)=L8(km)={ [Ppump7(dBm)-3]/αpump7, [Ppump8(dBm)-3]/αpump8}min；
In formula, L7For the length of first bypass fibers, unit km；L8For the length of second bypass fibers, unit is
km；Ppump7For the pumping light power of the first pumping source of the bypass, unit dBm；Ppump8For the second pumping source of the bypass
Pumping light power, unit dBm；αpump7It is the pump light that sends out of the first pumping source of the bypass in first bypass fibers
Loss factor, unit dB/km；αpump8It is the pump light that sends out of the second pumping source of the bypass in second bypass fibers
In loss factor, unit dB/km.
4. system according to claim 1, which is characterized in that described second meets following formula with the length of road optical fiber：
L4(km)=[Ppump5(dBm)-10]/αpump5；
In formula, L4For described second with road optical fiber length, unit km；Ppump5For the pump light work(with road pumping source
Rate, unit dBm；αpump5For the pump light sent out with road pumping source described second with the loss factor in the optical fiber of road,
Unit is dB/km.
5. system according to claim 1, which is characterized in that described first is with road optical fiber with described second with road optical fiber
Same fibre core, first bypass fibers and second bypass fibers are respectively independent fibre core；
The length of the length of first bypass fibers and second bypass fibers be described first with road optical fiber length
With described second with road optical fiber the sum of length.
6. system according to claim 2, which is characterized in that first Er-doped fiber and/or the second Er-doped fiber
The ranging from 5-6dB/m of absorption coefficient at 1530nm wavelength；First Er-doped fiber and/or the second Er-doped fiber numerical aperture
The ranging from 0.3-0.35 of diameter NA.
7. system according to claim 1, which is characterized in that the first pumping source of the bypass, the second pumping of the bypass
Source and it is described with road pumping source be that single order pumping, second-order pump or three ranks pump.
8. system according to claim 1, which is characterized in that the first remote gain unit and the described second long-range increasing
The gain ranging of beneficial unit is 18dB -28dB.
9. a kind of single spanning distance optical transmission system based on described in any claim in claim 1 to 8 carries out single spanning distance light biography
Defeated method, which is characterized in that including：
By the pump light that source signal light, the first pumping source of the bypass are sent out and the pumping that the second pumping source of the bypass is sent out
Light is input to the first remote gain unit, exports the first gain signal light；
The first gain signal light is input to by described first with road optical fiber to the letter of second front end wavelength division multiplexer
Number port, by the pump light sent out with road pumping source by described second with road optical fiber, second rear end wavelength-division multiplex
The signal port and pump ports of device are input to the pump ports of second front end wavelength division multiplexer；By second front end wave
The signal light of the public port output of division multiplexer is input to second rear end wavelength-division multiplex by second Er-doped fiber
The public port of device, the signal light that the signal port of the second rear end wavelength division multiplexer is exported is as the second gain signal light；
The second gain signal light with road optical fiber and described is input to light receiving unit by described second with road pumping source.
10. according to the method described in claim 9, it is characterized in that, the first remote gain unit includes the first front end wave
Division multiplexer and the first rear end wavelength division multiplexer, the public port of first front end wavelength division multiplexer pass through the first Er-doped fiber
It is connect with the public port of first rear end wavelength division multiplexer；
Accordingly, the pump light that source signal light, the first pumping source of bypass are sent out and the second pumping source of bypass are sent out
Pump light is input to the first remote gain unit, exports the first gain signal light, further comprises：
The source signal light is input to the signal port of first front end wavelength division multiplexer, by the first pumping of the bypass
The pump light that source is sent out is input to the pump ports of first front end wavelength division multiplexer by first bypass fibers；
The signal light that the public port of first front end wavelength division multiplexer exports is input to by first Er-doped fiber
The public port of first rear end wavelength division multiplexer, the pump light that the second pumping source of the bypass is sent out is by described second
Bypass fibers are input to the pump ports of first rear end wavelength division multiplexer, by the signal of first rear end wavelength division multiplexer
The signal light of port output is as the first gain signal light.
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Application publication date: 20180928 |